It is the year 3567 and an Olynssis barrier that disrupts space and time covers all of Earth. The planet is also being overrun by organic machines called Gardeners, which seek to exterminate all humans on the planet. Tokito Aizawa is part of a group of hunters who destroys Gardeners and sells the scraps. Although, after encountering a girl named Tea, who calls him 'Koichi', and her machine, Silver, his life becomes more complicated.